Grimes Aerospace Company A Wholly Owned Subsidiary of Honeywell International 550 State Route 55 URBANA, OHIO 43078
Grimes Aerospace Company A Wholly Owned Subsidiary of Honeywell International 550 State Route 55 URBANA, OHIO 43078
TO: HOLDERS OF COMPONENT MAINTENANCE MANUAL 33-50-42 FOR THE EMERGENCY EXIT
    LIGHT POWER SUPPLY, PART NUMBERS 60-1321-1, -1LB, -5, -5LB, -7, AND -7LB.
HIGHLIGHTS
Pages which have been added or revised are outlined below together with the highlights of the revision.
Remove and insert the affected pages as listed and enter Revision No. 4 dated Feb 1/06 on the Record of
Revisions Sheet.
101            Changed Part/Model Number for Variable Regulated Power Supplies to               All Models
               Commercially Available.
301 Moved step for removal of instruction plate to Repair section. All Models
401 Added NOTE to refer numbers in parenthesis to the IPL. All Models
601 Updated Part/Model Number address for Crimping Tool. All Models
602            Updated specification of conformal coating to Type UR. Updated nomenclature,     All Models
               specification, and manufacturer data of Primer PR-104 and PR-124.
603, 604       Deleted Surface Treatment Procedure. Added Battery Restoration Procedure to      All Models
               comply with TIL 384B.
619 Updated Grimes Aerospace Co. phone number. Added steps to replace labels. All Models
702 Moved step for installation of instruction plate to Repair section. All Models
901          Changed Part/Model Number for Variable Regulated Power Supplies to           All Models
             Commercially Available.
1009, 1011 Updated Numerical Index with new label numbers. All Models
1013 Added Superseded By data for items 5 and 10 and updated UPA for item 5. All Models
1015 Updated Detailed Parts Listing with new label data. All Models
PART NUMBERS
                   60-1321-1   60-1321-1LB
                   60-1321-5   60-1321-5LB
                   60-1321-7   60-1321-7LB
RECORD OF REVISIONS
Retain this record in the front of the manual. On receipt of revisions, insert revised pages in manual. Enter
revision number, date issued, date inserted and initials.
BASIC 3/1/83
1 6/30/93
2 7/1/00
3 10/1/05
4 2/1/06
B5-21119 1 6/30/93
60-1321-33-0028 1 6/30/93
TIL 82 2 7/1/00
TABLE OF CONTENTS
SUBJECT PAGE
INTRODUCTION
This publication contains shop maintenance instructions with Illustrated Parts List (IPL) for the emergency exit
light power supply, P/Ns 60-1321-1, -1LB, -5, -5LB, -7 and -7LB, manufactured by Grimes Aerospace
Company and hereafter referred to as the power supply.
The instructions in this publication provide information necessary to perform maintenance functions ranging
from simple checks and replacement to complete shop-type repair.
The instructions only apply to the power supply part numbers listed above. Be sure the part number on the
power supply is listed on the title page before performing any of these instructions.
This publication is written to the Air Transportation Association of America (ATA) Specification Number 100
and will be revised as necessary to show current information.
This publication is divided into sections as shown in the preceding Table of Contents. Also refer to the Table
of Contents for page location of each applicable section.
An explanation of how to use the Illustrated Parts List (IPL) is provided in the introduction of that section.
The following sections of this publication have been verified on the date(s) specified. Where actual
performance of the functions (tasks) cannot be performed prior to issuing a manual, those functions (tasks)
shall be verified by simulation. Any function (task) verified by simulation must be verified by actual
performance at the earliest possible time.
     A.   The power supply automatically energizes an external emergency exit light when aircraft power
          failure occurs. An external switch controls the operation of the power supply. On power supply
          P/N 60-1321-7, an external flight attendant switch can be used to operate the power supply.
          NOTE:         Batteries are not provided on power supplies with an LB suffix in their part numbers.
                        In this manual, power supplies are assumed to have battery assemblies.
• Cover assembly
• Battery assembly
• Housing assembly
     D.   The cover assembly allows access to the rechargeable battery assembly. The cover assembly
          attaches to the housing assembly with quarter-turn fasteners for easy removal.
                                               Power Supply
                                                 Figure 1
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                                    GRIMES AEROSPACE COMPANY
                                  COMPONENT MAINTENANCE MANUAL
                                        PART NUMBER 60-1321
     E.   The battery assembly attaches to the cover assembly with quarter-turn fasteners. A support
          assembly holds the housing assemblies and battery assembly together. It also has an insulator
          assembly. The insulator assembly electrically connects the battery assembly and housing assembly.
          The battery assembly has six C-size, nickel-cadmium cells welded together with nickel straps. A
          fully charged battery assembly can energize an external emergency exit light for approximately 20
          minutes.
     F.   The housing assembly contains the electrical components of the power supply. A connector on the
          housing assembly connects the power supply to external control switches, emergency exit lights
          and power sources. The housing assembly also has a terminal assembly to connect power to the
          battery assembly.
     A.   The power supply has components to prevent damage by voltage spikes. It also has components to
          prevent power fluctuations from causing the power supply to operate incorrectly.
     B.   An external pilot’s switch controls the operation of the power supply. The power supply circuits
          operate as follows:
          (1) With the pilot’s switch in the ON position, the power supply operates as it does during a power
              failure. The pilot’s switch can be set to ON to test the power supply.
          (2) With the pilot’s switch in the ARMED position, current on the input charge line charges the
              battery assembly. If a power failure occurs, the power supply automatically energizes an exit
              light.
          (3) With the pilot’s switch in the OFF position, the silicon-controlled rectifier (SCR1) goes off. This
              causes the power supply to go off. This is done after a power failure to prepare the power
              supply for normal operation.
     C.   On power supply P/N 60-1321-7, a flight attendant’s switch is used to operate the power supply.
          When set to ON, the power supply energizes the exit light.
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                              COMPONENT MAINTENANCE MANUAL
                                    PART NUMBER 60-1321
     (1) With the pilot’s switch in the ON position, 28 Vdc is applied to the power supply ARM circuit
         through connector (J1), pin 3. Power is removed from the CHARGE circuit on connector (J1),
         pin 2.
     (2) Power removed from connector (J1), pin 2, causes the junction of diode (CR7) and
         resistors (R12 and R14) to go low. This applies a low to the inputs of integrated circuit (U1),
         pins 1 and 2. The output of integrated circuit (U1), pin 3, goes high.
     (3) The voltage on connector (J1), pin 3, is applied to the gate of silicon-controlled rectifier (SCR1).
         This causes silicon-controlled rectifier (SCR1) to conduct. Battery current flows through silicon-
         controlled rectifier (SCR1) and causes transistors (Q1 and Q2) to switch on.
     (4) When transistors (Q1 and Q2) conduct, zener diode (CR4) applies regulated power (Vcc) to
         integrated circuit (U1), pin 14. Current also flows through potentiometer (R15). This causes the
         input of integrated circuit (U1), pin 9, to go high.
     (5) With both inputs of integrated circuit (U1), pins 9 and 10, at a high level, the output of
         integrated circuit (U1), pin 8, goes low. The inputs of integrated circuit (U1), pins 4 and 5, also
         go low. The output of integrated circuit (U1), pin 6, then goes high.
     (6) When the outputs of integrated circuit (U1), pins 3 and 6, both go high, transistor (Q3)
         conducts. This causes transistors (Q4 and Q5) to switch on. Battery current flows through
         transistor (Q5) and causes the emergency exit light to come ON.
     (1) A circuit latches the power supply OFF when the battery voltage goes below a set shutoff level.
         This causes the emergency exit light to go OFF. The latch circuit prevents battery damage
         caused by cell reversal. This can occur when the battery cells discharge too much. The pilot’s
         switch must be set to OFF and power must be applied to the input to release the latch circuit.
     (2) Potentiometer (R15) sets the shutoff level. When the battery voltage drops to 5.2 to 5.6 Vdc,
         potentiometer (R15) applies a low to integrated circuit (U1), pin 9.
     (3) The output of integrated circuit (U1), pin 8, goes high. The inputs at integrated circuit (U1),
         pins 4 and 5, also go high. This causes the output of integrated circuit (U1), pin 6, to go low.
         This causes transistors (Q3, Q4 and Q5) to shut off. The emergency exit light goes OFF.
     (4) Integrated circuit (U1) inverts the high signal at pin 8 at pins 12 and 13. The output of
         integrated circuit (U1), pin 11, goes low. This latches the output of integrated circuit (U1), pin 8,
         high. The circuit stays in this condition until the latch circuit is released.
     (1) With the pilot’s switch in the ARMED position, input power is applied to the power supply
         through connector (J1), pins 2 and 3.
     (2) On power supply P/N 60-1321-7, resistor (R20), capacitors (C6 and C7) and diodes (CR9
         and CR10) make a half-wave rectifier. This circuit converts the 115-Vac input at connector (J1),
         pin 2, to direct current. The rectifier circuit applies this dc voltage to blocking diode (CR1).
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                             COMPONENT MAINTENANCE MANUAL
                                   PART NUMBER 60-1321
     (3) Current flows through blocking diode (CR1), current limiting-resistor (R1) and battery
         assembly (BT1) to ground at connector (J1), pin 5. Battery assembly (BT1) charges
         continuously until a power failure occurs.
     (4) Power removed from connector (J1), pin 2, causes the junction of diode (CR7) and
         resistors (R12 and R14) to go low. This applies a low to the inputs of integrated circuit (U1),
         pins 1 and 2. The output of integrated circuit (U1), pin 3, goes high.
     (5) The voltage on connector (J1), pin 3, goes to the gate of silicon-controlled rectifier (SCR1). This
         causes silicon-controlled rectifier (SCR1) to conduct. Battery current flows through silicon-
         controlled rectifier (SCR1) and causes transistors (Q1 and Q2) to turn on.
     (6) When transistors (Q1 and Q2) conduct, zener diode (CR4) applies regulated power (Vcc) to
         integrated circuit (U1), pin 14. Current also flows through potentiometer (R15). This causes the
         output of integrated circuit (U1), pin 9, to go high.
     (7) With both inputs of integrated circuit (U1), pins 9 and 10, at a high level, the output of
         integrated circuit (U1), pin 8, goes low. The inputs of integrated circuit (U1), pins 4 and 5, also
         go low. The output of integrated circuit (U1), pin 6, then goes high.
     (8) When the outputs of integrated circuit (U1), pins 3 and 6, both go high, transistor (Q3)
         conducts. This causes transistors (Q4 and Q5) to switch on. Battery current flows through
         transistor (Q5) and causes the emergency exit light to turn ON.
     (1) With the pilot’s switch in the OFF position, input power is applied to connector (J1), pins 2
         and 4.
     (2) On power supply P/N 60-1321-7, resistor (R20), capacitors (C6 and C7) and diodes (CR9
         and CR10) make a half-wave rectifier. This circuit converts the 115-Vac input at connector (J1),
         pin 2, to direct current.
     (3) Current flows through diode (CR6). This causes the junction of resistors (R12 and R14) and
         diode (CR7) to go high. The potentials on both sides of diode (CR7) balance. The causes the
         output of integrated circuit (U1), pin 3, to go low. Transistors (Q3, Q4 and Q5) switch off. This
         stops the flow of current through transistor (Q5) and to the emergency exit light.
     (4) The voltage from connector (J1), pin 4, back-biases silicon-controlled rectifier (SCR1). This
         stops the flow of current from battery assembly (BT1) through silicon-controlled
         rectifier (SCR1). Transistors (Q1 and Q2) switch off. This removes the regulated power (Vcc)
         from integrated circuit (U1).
     (1) When the flight attendant’s switch is set to ON, ground potential is removed from the junctions
         of diodes (CR11 and CR12). This allows current from the charge circuit to flow to the base of
         transistor (Q6). This causes transistor (Q6) to conduct. This causes transistors (Q7 and Q5) to
         switch on. Battery current flows through transistor (Q5) and causes the emergency exit light to
         come ON.
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              (2) When the flight attendant’s switch is set to NORMAL, ground potential is applied to the
                  junctions of diodes (CR11 and CR12). This switches transistor (Q6) off. Transistors (Q7
                  and Q5) then switch off. This stops the flow of current through transistor (Q5) and to the
                  emergency exit light.
DESCRIPTION DATA
     Dimensions:
       Length ................................................................................................................... 8.75 inches (222,3 mm)
       Width ..................................................................................................................... 5.50 inches (139,7 mm)
       Height ..................................................................................................................... 2.66 inches (67,6 mm)
     Weight (max): ................................................................................................................. 3.50 pounds (1,6 kg)
     Electrical:
        Input Voltage (charge circuit)
             P/N 60-1321-1 ................................................................................................................. 25 to 28 Vdc
             P/N 60-1321-5 ..................................................................................................................25 to 28 Vdc
             P/N 60-1321-7 ........................................................................................................... 115 Vac, 400 Hz
        Input Current Draw (charge) ............................................................................................... 255 to 275 mA
        Input Voltage (ARM/DISARM circuits) ................................................................................... 18 to 31 Vdc
        Charge Time @ 28 Vdc ................................................................................................................ 16 hours
        Output Voltage (min) ...................................................................................................................... 6.4 Vdc
        Output Current Draw (max) ......................................................................................................... 4.5 amps
        Battery Discharge Time
             At 68 °F (°C) ...................................................................................................................... 20 minutes
             At 30 °F (°C) ...................................................................................................................... 10 minutes
        Battery Shutoff Voltage (adjustable) .................................................................................... 5.4 to 5.8 Vdc
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                                       GRIMES AEROSPACE COMPANY
                                     COMPONENT MAINTENANCE MANUAL
                                           PART NUMBER 60-1321
1. General Information.
A. The following paragraphs provide information for testing and fault isolation of the power supply.
       B.    Conduct all tests at a temperature of 65 to 85 °F (18 to 29 °C) and in the order presented, unless
             otherwise noted. Failure of any test is cause for failure of the power supply. Correct the fault before
             testing is continued.
       C.    Refer to Table 101 for a list of special tools, fixtures and equipment needed for testing and fault
             isolation. Refer to Table 102 for a list of materials needed for testing and fault isolation. Equivalent
             substitutes are acceptable.
2. Pretest Procedures.
A. Review any shipping tags or forms to determine cause for removal from aircraft.
B. Wipe the power supply with a clean cloth to remove dirt, dust and foreign material.
     C.   Visually inspect the power supply for signs of missing, broken, bent or cracked parts. Damaged
          parts shall be replaced before the power supply is tested.
          NOTE:          Refer to IPL Figure 1 for an illustration. Numbers in parentheses ( ) refer to item
                         numbers on the illustration.
Power supply P/N 60-1321-7 uses an AC and a DC power supply for following test.
Power supply P/Ns 60-1321-1 and -5 use only a DC power supply for following test.
A. Ensure power supplies are set to zero volts and are OFF.
     B.   Loosen four studs (20) and remove cover subassembly (-15) and battery assembly (-115A) from
          power supply under test.
C. Position cover subassembly (-15) on power supply under test and tighten four studs (20).
          (5) If testing power supply P/N 60-1321-7, set switch S9 to 115. If testing power supply
              P/Ns 60-1321-1 or 60-1321-5, set switch S9 to 28.
                                                    Test Setup
                                                    Figure 101
4. Testing.
     NOTE:           Refer to the IPL for illustrations. Numbers in parentheses ( ) refer to item numbers on the
                     illustration.
B. If testing power supply P/N 60-1321-7, turn on AC power supply and adjust it to 115 ±0.1 Vac.
E. If testing power supply P/Ns 60-1321-1 and -3, momentarily depress switch S6 on tester.
F. If testing power supply P/N 60-1321-7, momentarily turn AC power supply OFF.
L.   Depress switch S3 on tester and slowly rotate DROPOUT CONTROL rheostat counterclockwise.
     Observe reading on DMM #1 as load lamps on tester extinguish. Adjust potentiometer (R15) (70,
     IPL Figure 3) to obtain required reading on DMM.
• Voltage reading shall be 5.6 ±0.2 Vdc as load lamps on tester extinguish.
W. Loosen four studs (20, IPL Figure 1) and remove cover subassembly (-15) from power supply under
   test.
Y. Position cover subassembly (-15) on power supply under test and tighten four studs (20).
CC. Turn power supplies OFF and disconnect power supply under test from test setup.
DD. Loosen four studs (20) and remove cover subassembly (-15) from power supply under test.
     EE. Seal adjustment screw of potentiometer (R15) (70, IPL Figure 3) with adhesive. Use a clean cloth to
         remove excess adhesive. Allow to air dry for 4 hours.
     FF. Position cover subassembly (-15, IPL Figure 1) on power supply under test and tighten four
         studs (20).
5. Posttest Procedures.
     A.   If power supply passed all the tests, prepare it for shipment or storage. Refer to ASSEMBLY,
          section 701, for details.
     B.   If power supply did not pass all the tests, repair or replace defective parts, then repeat all tests.
          Refer to Fault Isolation, paragraph 6, for details.
     NOTE:         Refer to the IPL for illustrations. Numbers in parentheses ( ) refer to item numbers on the
                   illustration.
DISASSEMBLY
1. General Information.
A. The following paragraphs provide information for disassembly of the power supply.
     B.   Disassemble only to the extent required to replace defective parts, unless complete overhaul is
          required. Before disassembly, wipe exterior surfaces with a clean cloth to remove dust, dirt or other
          foreign materials.
C. Do not remove threaded inserts. Refer to CHECK, section 501, for details.
     D.   Do not disassemble riveted parts. Refer to REPAIR, section 601, to determine whether part(s) can
          be replaced.
     E.   Do not remove electrical wires unless repair or replacement is required. Tag electrical wires before
          removal.
     F.   Refer to Table 301 for a list of materials needed for disassembly. Equivalent substitutes are
          acceptable.
     NOTE:         Refer to IPL Figure 1 for an illustration. Numbers in parentheses ( ) refer to item numbers
                   on the illustration.
     A.   Loosen four studs (20) and remove cover subassembly (-15) and battery assembly (-115A) from
          housing subassembly (300).
     B.   Loosen studs (155)      and    (160)    and   separate   battery   assembly (-115A)     from    cover
          subassembly (-15).
     NOTE:    Refer to IPL Figure 1 for an illustration. Numbers in parentheses ( ) refer to item numbers on
              the illustration.
     A.   Remove four screws (125) and separate support (165) from battery assembly (-115A); take care not
          to damage wires leading to battery assembly (-115A).
B. Remove three washers (150), stud (155) and two studs (160) from support (165).
     C.   Remove stopnut (145), washer (140), insulator (130) and screw (135) from support (165); take care
          not to damage wires leading to battery assembly (-115A).
     D.   Remove six screws (175), housing (185), two cushioning pads (190) and battery assembly
          (BT1) (275) from housing (295).
     NOTE:    Refer to IPL Figure 1 for an illustration. Numbers in parentheses ( ) refer to item numbers on
              the illustration.
A. Remove four studs (20) and washers (25) from cover plate (110).
B. Remove two locknuts (45) and receptacles (40) from bracket subassemblies (-50).
C. Remove four screws (35) and two bracket subassemblies (-50) from cover plate (110).
D. Remove two screws (70) and bracket assembly (-65) from cover plate (110).
     E.   Remove six screws (175), housing (185), two cushioning pads (190) and battery assembly
          (BT1) (275) from housing (295).
CLEANING
1. General Information.
A. The following paragraphs provide information for cleaning the power supply.
B. Refer to Table 401 for a list of materials needed for cleaning. Equivalent substitutes are acceptable.
2. Cleaning Procedures.
     NOTE:         Refer to IPL Figure 1 for an illustration. Numbers in parenthesis ( ) refer to item numbers
                   on the illustration.
     A.   Clean metal parts in aqueous cleaner. Use a soft, natural, bristle brush to remove ground-in
          deposits.
     B.   Use a clean cloth dampened with aqueous cleaner to remove old adhesive/sealant residue from
          parts.
     C.   Except for printed circuit boards, wipe electrical parts with a clean cloth dipped in aqueous cleaner
          to remove dirt, dust, and foreign material.
D. Wipe printed circuit boards with a dry, clean cloth to remove dirt or dust.
          WARNING:       AIR PRESSURE SHALL BE LIMITED TO 30 PSI (207 KPA). FAILURE TO COMPLY
                         MAY RESULT IN INJURY OR DEATH TO PERSONNEL.
E. Dry parts with compressed air or wipe with a clean cloth and allow to air-dry.
CHECK
1. General Information.
A. The following paragraphs provide information for a check of each part in the power supply.
     B.   Complete checks in accordance with the standard requirements and checks listed in the following
          paragraphs, unless otherwise specified.
C. Refer to Table 501 for a list of materials needed for checks. Equivalent substitutes are acceptable.
2. Standard Requirements.
A. Clean the parts before performing any check. Refer to CLEANING, section 401, for details.
     C.   Repair or replace the parts that exceed limits. Refer to REPAIR, section 601, for details. Use parts
          within limits for assembly. Refer to ASSEMBLY, section 701, for details.
3. Standard Checks.
     A.   Examine parts for nicks, gouges, scratches or small burrs. If any are deeper than 0.03 inch
          (0,76 mm), replace part. Minor damage may be repaired.
     B.   Examine parts for corrosion. If deeper than 0.03 inch (0,76 mm) or more than 20 percent of surface
          is damaged, replace part. Minor damage may be repaired.
     C.   Examine painted parts for scratches, peeling, flaking or chipping. Minor damage may be repaired.
          See REPAIR, section 601, for details.
     D.   Examine threaded parts with a thread gage for distortion or stripping. If not a Class-3 fit, replace
          part.
E. Examine threaded inserts for stripping and tight fit. If damaged or loose, replace part.
     F.   Examine electrical parts for cracks, distortion, bent pins or signs of burned connections. If damaged,
          replace parts.
     NOTE:          Refer to the IPL for illustrations. Numbers in parentheses ( ) refer to item numbers on the
                    illustration.
REPAIR
1. General Information.
A. The following paragraphs provide information for repair of parts in the power supply.
     B.     Limit repair procedures to correction of minor defects or damage, paint touch-up and replacement of
            parts. Refer to CHECK, section 501, for details.
            CAUTION:      HEAT-SENSITIVE PARTS. USE A HEAT SINK; APPLY HEAT FOR A MAXIMUM OF
                          10 SECONDS AT A TEMPERATURE NOT TO EXCEED 300 °F (149 °C) TO AVOID
                          DAMAGE.
C. Apply solder in accordance with MIL-STD-454. Remove excess with a clean cloth.
     D.     Use conformal coating to seal solder connections and electronic parts in accordance with
            MIL-STD-275.
     E.     Use same color and type to replace electrical wires. Strip insulation 0.25 inch (6,35 mm). Use solder
            to tin end, then attach to another component.
            CAUTION:      DO NOT USE CROCUS CLOTH ON ALUMINUM PARTS. CLOTH CONTAINS IRON
                          OXIDE, WHICH CAUSES RAPID OXIDATION OF ALUMINUM.
G. Use aluminum oxide abrasive cloth on aluminum parts. Use crocus cloth on steel parts.
     H.     Refer to Table 601 for a list of special tools, fixtures and equipment required for repair. Refer to
            Table 602 for a list of materials needed for repair. Equivalent substitutes are acceptable.
            (1) Discharge each cell in the battery assembly (BT1) (275, IPL Figure 1) separately until the
                voltage across each cell is below 0.2 Vdc. Immediately remove the load.
            (1) Charge the battery assembly (BT1) (275, IPL Figure 1) with 250 - 275 mA initially for at least 16
                hours.
                        NOTE:          More than one battery pack can be charged at the same time when the
                                       battery packs are connected in series. Battery packs should not be
                                       charged in parallel without individual charging resistors. For example,
                                       use a 28-Vdc power supply and a 75-ohm/5W resistor to charge each
                                       battery (six series-connected cells).
          CAUTION:      DISCHARGE OF THE BATTERY PACK DURING THIS TEST FOR MORE THAN 20
                        MINUTES CAN CAUSE DAMAGE OF ONE OR MORE CELLS BECAUSE OF CELL
                        REVERSAL.
          (1) Connect the battery assembly (BT1) (275, IPL Figure 1) to a 2-ohm, 50W adjustable resistor
              set for 1.72 to 1.76 ohms; e.g., Ohmite D50K2R0 through an ammeter. The battery pack must
              deliver 3.75 Amps, minimum, for 20 minutes. During discharge, the minimum cell voltage must
              be 1.1 Vdc. If the cell voltage is less than 1.1 Vdc, replace the cell.
D. Charge
(1) Recharge the battery assembly (BT1) (275) after the capacitance test. Refer to step B.
     CAUTION:      DO NOT CHANGE SURFACE FINISH OR PART SHAPE OR EXCEED WEAR LIMITS.
                   FAILURE TO COMPLY CAN RESULT IN FAILURE OF THE PART.
4. Surface Finish Procedure. This procedure shall be used for touch-up of scratches and surface defects.
     NOTE:         Refer to the IPL for illustrations. Numbers in parentheses ( ) refer to item numbers on the
                   illustration.
A. Repair area if required. Refer to Standard Repair Procedures, paragraph 2, for details.
     B.   Apply chemical film to surface if required. Refer to Surface Treatment Procedure, paragraph 3, for
          details.
C. If not already done, cover areas not to be treated with masking tape.
     D.   Apply primer (PR-124) to exterior surfaces of housing (160, IPL Figure 2) and cover plate (110, IPL
          Figure 1) as follows:
          (2) Apply one coat of primer to damaged area. Allow to air dry or place in an oven for one hour at
              200 °F (93 °C).
     E.   Apply primer (PR-184) to exterior surfaces of housing (160, IPL Figure 2) and cover plate (110, IPL
          Figure 1) as follows:
          (2) Apply one coat of primer to damaged area. Allow to air dry or place in an oven for one hour at
              200 °F (93 °C).
          WARNING:      PAINT IS FLAMMABLE AND TOXIC TO EYES, SKIN AND RESPIRATORY TRACT.
                        SKIN AND EYE PROTECTION REQUIRED. AVOID REPEATED OR PROLONGED
                        CONTACT. USE ONLY IN WELL-VENTILATED AREAS. KEEP AWAY FROM OPEN
                        FLAMES OR OTHER SOURCES OF IGNITION.
     F.   Apply paint to exterior surfaces of housing (160, IPL Figure 2) and cover plate (110, IPL Figure 1) as
          follows:
          (2) Apply one coat of paint to damaged area. Allow to air dry or place in an oven for one hour at
              200 °F (93 °C).
          (3) When dry, apply a second coat of paint. Allow to air dry or place in an oven for one hour at
              200 °F (93 °C).
          (4) When dry, remove masking tape and check finish is smooth, free of defects and blends into
              other surfaces.
     NOTE:        Refer to IPL Figure 1 for an illustration. Numbers in parentheses ( ) refer to item numbers
                  on the illustration.
          (1) Drill out four rivets (100) and remove two plates (105) and handle (95) from cover plate (110).
              Discard handle (95).
(2) Position new handle (95) and two plates (105) on cover plate (110) and align holes.
          (1) Use an arbor press to remove two clinch nuts (55) from bracket (60). Discard two clinch
              nuts (55).
(2) Use an arbor press to install two new clinch nuts (55) in bracket (60).
              (a) Drill out two rivets (80) and remove receptacle (75) from bracket (90). Discard
                  receptacle (75).
(b) Position new receptacle (75) on bracket (90) and align holes.
(c) Install two new rivets (80) on bracket (90) in accordance with MIL-R-47196.
              (a) Use an arbor press to remove two clinch nuts (85) from bracket (90). Discard two clinch
                  nuts (85).
(b) Use an arbor press to install two new clinch nuts (85) in bracket (90).
     NOTE:        Refer to IPL Figure 1 for an illustration. Numbers in parentheses ( ) refer to item numbers
                  on the illustration.
(1) Use a soldering iron to disconnect two wires from insulator (130). Discard insulator (130).
(2) Use a soldering iron and electrical solder to solder two wires to insulator (130).
          (1) Use a soldering iron to disconnect two wires from insulator (130) and two contacts on
              housing (295). Discard wires.
          (2) Slide a 1.5-inch (38 mm) piece of heat shrink tubing (M23053-5-104-0) over a 3-inch (76 mm)
              piece of electrical wire (WI-348).
          (3) Use a soldering iron and electrical solder to solder electrical wire prepared in step (2) to contact
              on housing (295) and insulator (130).
(4) Use a heat gun to secure heat shrink tubing (M23053-5-104-0) in place.
          (5) Use a soldering iron and electrical solder to solder a 7-inch (178 mm) piece of electrical wire
              (WI-954) to contact on housing (295) and insulator (130).
     NOTE:         Refer to the IPL for illustrations. Numbers in parentheses ( ) refer to item numbers on the
                   illustration.
(1) Use a sharp knife to remove heat shrink tubing from two terminals of resistor (R1) (5).
(2) Cut two electrical wires at base of resistor (R1) (5) terminals.
          (3) Remove two stopnuts (15), screws (10) and resistor (R1) (5) from housing (160). Discard
              resistor (R1) (5).
          (4) Position new resistor (R1) (5) on housing (160) and secure with two screws (15) and
              stopnuts (10).
(5) Slide two 0.5-inch (12,7 mm) pieces of heat shrink tubing (TU-285) over two electrical wires.
          (6) Strip 0.25 inch (6,35 mm) of insulation from ends of two electrical wires leading to new
              resistor (R1) (5).
          (7) Use a soldering iron and electrical solder to connect two electrical wires to new
              resistor (R1) (5).
     (8) Slide heat shrink tubing (TU-285) over solder connections and use a heat gun to secure them
         in place.
(1) Remove four stopnuts (55), screws (50) and connector (J1) (45) from housing (160).
(2) Remove three seal plugs from connector (J1) (45). Discard seal plugs if damaged.
     (3) Use an extraction/insertion tool to remove 12 contacts from connector (J1) (45). Discard
         connector (J1) (45) if damaged.
     (5) Strip 0.25 inch (6,35 mm) of insulation from ends of 12 electrical wires leading to
         connector (J1) (45).
     (6) Use a crimping tool (M22520/1-01) to install 12 new contacts (M39029/31-241) on 12 electrical
         wires.
     (7) Use an extraction/insertion tool to install 12 new contacts (M39029/31-241) and electrical wires
         in connector (J1) (45).
(8) Install three new seal plugs (MS27488-20) on connector (J1) (45).
     (9) Position connector (J1) (45) on housing (160) and secure with four screws (50) and
         stopnuts (55).
(1) Remove stopnut (75), washer (80) and terminal from housing (160).
(3) Strip 0.25 inch (6,35 mm) of insulation from ends of electrical wire leading to terminal.
(4) Use a crimping tool (47386) to install new terminal (TE-089) on electrical wire.
     (5) Position new terminal (TE-089) and electrical wire on housing (160) and secure with
         washer (80) and stopnut (75).
(1) Remove two screws (90) and terminal assembly (-85) from housing (160).
(2) Remove stopnut (100) and pin (95) from bracket (135). Discard pin (95) if damaged.
     (4) Use a soldering iron to remove two terminals (105) from banana plugs (110). Discard
         terminals (105) and banana plugs (110) if damaged.
     (5) Drill out rivet (120) and remove insulator (115) from bracket (135). Discard insulator (115) if
         damaged.
     (6) Use an arbor press to press out two clinch nuts (130) from bracket (135). Discard clinch
         nuts (130).
(7) Use an arbor press to install two clinch nuts (130) on bracket (135).
(8) Position new insulator (115) on bracket (135) and align holes.
(10) Position new banana plug (110) and new terminal (105) on new insulator (115).
     (11) Use a soldering iron and electrical solder to secure new terminal (105) and new banana
          plug (110) to new insulator (115).
(12) Repeat steps (10) and (11) for remaining new banana plug (110) and new terminal (105).
     (13) Strip 0.25 inch (6,35 mm) of insulation from ends of electrical wire leading to two new
          terminals (105).
(14) Use a soldering iron and electrical solder to install two electrical wires on new terminals (105).
(15) Position new pin (95) on bracket (135) and secure with stopnut (100).
(16) Position terminal assembly (-85) on housing (160) and secure with two screws (90).
     (1) Remove four stopnuts (30), spacers (35), screws (25), printed circuit card assembly (20) and
         insulator (40) from housing (160).
(a) Use a soldering iron to remove electrical wire from damaged terminal(s) (110).
          (b) Use a soldering iron to remove terminal(s) (110) from printed wiring board (190). Discard
              terminal(s) (110).
          (d) Use a soldering iron and electrical solder to solder new terminal(s) (110) to printed wiring
              board (190).
(e) Apply conformal coating to repair areas. Allow to air dry for 4 hours.
    (b) Remove rectifier (SCR1) (15) and mounting pad (20) from printed wiring board (190).
        Discard rectifier (SCR1) (15).
(c) Position new rectifier (SCR1) (15) and mounting pad (20) on printed wiring board (190).
    (d) Use a soldering iron and electrical solder to solder new rectifier (SCR1) (15) to printed
        wiring board (190).
(e) Apply conformal coating to repair areas. Allow to air dry for 4 hours.
(4) Replace transistors (Q1 and Q3) (145), (Q2) (60) and (Q4) (125) as follows:
(a) Use a soldering iron to disconnect transistor (Q1) (145) from printed wiring board (190).
    (b) Remove transistor (Q1) (145) and mounting pad (150) from printed wiring board (190).
        Discard transistor (Q1) (145).
(c) Position new transistor (Q1) (145) and mounting pad (150) on printed wiring board (190).
    (d) Use a soldering iron and electrical solder to solder the leads of new transistor (Q1) (145)
        to printed wiring board (190).
(e) Apply conformal coating to repair areas. Allow to air dry for 4 hours.
    (f)   Repeat steps (a) through (e) for transistors (Q3) (145), (Q2) (60) and (Q4) (125) and
          mounting pads (65), (150) and (130) as necessary.
(a) Remove self-locking nut (90), lockwasher (85) and terminal from transistor (Q5) (75).
(c) Strip 0.25 inch (6,35 mm) of insulation from end of electrical wire.
(d) Use a crimping tool (47386) to install new terminal (TE-089) on electrical wire.
    (e) Position new terminal (TE-089) on transistor (Q5) (75) and secure with lockwasher (85)
        and self-locking nut (90).
(a) Use a soldering iron to unsolder transistor (Q5) (75) from printed wiring board (190).
    (b) Remove two self-locking nuts (90), lockwashers (85), screws (80), terminal,
        transistor (Q5) (75) and heat sink (100) from printed wiring board (190). Discard
        transistor (Q5) (75).
    (c) Position heat sink (100) and new transistor (Q5) (75) on printed wiring board (190) and
        secure with two screws (80), terminal, two lockwashers (85) and self-locking nuts (90).
    (d) Use a soldering iron and electrical solder to solder new transistor (Q5) (75) to printed
        wiring board (190).
(e) Apply conformal coating to repair areas. Allow to air dry for 4 hours.
    (a) Use a soldering iron to remove capacitor (C3) (40) from printed wiring board (190).
        Discard capacitor (C3) (40).
    (b) Apply adhesive (AD-040) to mating surfaces of new capacitor (C3) (40) and printed wiring
        board (190).
    (c) Install new capacitor (C3) (40) on printed wiring board (190). Use a clean cloth to remove
        excess adhesive. Allow to air dry for 4 hours.
    (d) Use a soldering iron and electrical solder to solder capacitor (C3) (40) to printed wiring
        board (190).
(e) Apply conformal coating to repair areas. Allow to air dry for 4 hours.
    (a) Use a soldering iron to remove resistors (R8) (55) and (R13) (140) from printed wiring
        board (190). Discard resistors (R8) (55) and (R13) (140).
    (b) Mount new resistors (R8) (55) and (R13) (140) 0.020 to 0.065 inch (0,51 to 1,65 mm) from
        surface of printed wiring board (190).
    (c) Use a soldering iron and electrical solder to solder new resistors (R8) (55) and (R13) (140)
        to printed wiring board (190).
(d) Apply conformal coating to repair areas. Allow to air dry for 4 hours.
    (a) Remove self-locking         nut (90),   lockwasher (85)   and    terminal   with   wire   from
        transistor (Q5) (75).
    (b) Use a soldering iron to remove electrical wire from printed wiring board (190). Discard
        electrical wire.
    (c) Strip 0.25 inch (6,35 mm) of insulation from ends of a 2.125-inch (53,98 mm) piece of
        electrical wire (WI-502).
    (d) Use a crimping tool (47386) to install new terminal (TE-089) on one end of electrical wire
        (WI-502).
    (e) Position new terminal (TE-089) and electrical wire (WI-502) on transistor (Q5) (75) and
        secure with lockwasher (85) and self-locking nut (90).
    (f)   Use a soldering iron and electrical solder to solder other end of electrical wire (WI-502) to
          printed wiring board (190).
(g) Apply conformal coating to repair areas. Allow to air dry for 4 hours.
    (a) Use a soldering iron to remove bus wire and tubing from component side of printed wiring
        board (190). Discard bus wire and tubing.
    (b) Place a 0.313-inch (7,95 mm) piece of tubing (TU-170) over a 1-inch (25 mm) piece of bus
        wire (WI-646).
    (c) Use a soldering iron and electrical solder to solder bus wire to component side of printed
        wiring board (190).
         (d) Use a soldering iron to remove bus wire and tubing from solder side of printed wiring
             board (190). Discard bus wire and tubing.
         (e) Place a 1.25-inch (31,8 mm) piece of tubing (TU-170) over a 1.75-inch (44,5 mm) piece of
             bus wire (WI-646).
         (f)   Use a soldering iron and electrical solder to solder bus wire to solder side of printed wiring
               board (190).
(g) Apply conformal coating to repair areas. Allow to air dry for 4 hours.
     (11) Position circuit card assembly (20, IPL Figure 2) and insulator (40) in housing (160) and secure
          with four screws (25), spacers (35) and stopnuts (30).
     (1) Remove four stopnuts (150), spacers (155), screws (145) and circuit card assembly (140) from
         housing (160).
(2) Replace capacitors (C6) (5, IPL Figure 4) and (C7) (50) as follows:
         (a) Use a soldering iron to remove capacitors (C6) (5) and (C7) (50) from printed wiring board
             (55). Discard capacitors (C6) (5) and (C7) (50).
         (b) Apply primer (AD-059) and adhesive (AD-053) to mating                      surfaces    of   new
             capacitors (C6) (5) and (C7) (50) and printed wiring board (55).
(c) Position capacitors new (C6) (5) and (C7) (50) on printed wiring board (55).
         (d) Use a soldering iron and electrical solder to solder new capacitors (C6) (5) and (C7) (50)
             to printed wiring board (55). Use a clean cloth to remove excess primer and adhesive.
             Allow to air dry for 4 hours.
(e) Apply conformal coating to repair areas. Allow to air dry for 4 hours.
          (a) Use a soldering iron to disconnect transistors (Q6) (15) and (Q7) (10) from printed wiring
              board (55).
          (b) Remove transistors (Q6) (15) and (Q7) (10) and two mounting pads (20) from printed
              wiring board (55). Discard transistors (Q6) (15) and (Q7) (10).
          (c) Position new transistors (Q6) (15) and (Q7) (10) and two mounting pads (20) on printed
              wiring board (55).
          (d) Use a soldering iron and electrical solder to solder leads of new transistors (Q6) (15)
              and (Q7) (10) to printed wiring board (55).
(e) Apply conformal coating to repair areas. Allow to air dry for 4 hours.
     (4) Position circuit card assembly (140, IPL Figure 2) and four spacers (155) in housing (160) and
         secure with four screws (145) and stopnuts (150).
(1) Remove stopnut (75), washer (80) and terminal from housing (160).
(2) Use a sharp knife to remove heat shrink tubing from two terminals of resistor (R1) (5).
(3) Use a soldering iron to remove damaged electrical wire(s) from resistor (R1) (5).
(4) Use a sharp knife to remove heat shrink tubing from two wires leading from resistor (R1) (5).
(5) Remove four stopnuts (55), screws (50) and connector (J1) (45) from housing (160).
     (6) Use an extraction/insertion tool to remove damaged wire(s) and contact(s) from
         connector (J1) (45).
(7) Use a soldering iron to remove damaged electrical wire(s) from circuit card assembly (20).
(8) Use a soldering iron to remove damaged electrical wire(s) from circuit card assembly (140).
     (9) Remove self-locking nut (90, IPL Figure 3), lockwasher (85) and terminal and electrical wire
         from printed circuit card assembly (20, IPL Figure 2).
(10) Remove two screws (90) and terminal assembly (-85) from housing (160).
(11) Use a soldering iron to remove damaged electrical wires from terminal(s) (105).
(13) Position new electrical wires as needed. Refer to Figure 604 and Table 1 for wiring diagrams.
     Refer to Table 603 and Table 604 for wire lists for the power supply.
(14) Strip 0.25 inch (6,35 mm) from ends of new electrical wires.
(15) Use a soldering iron and electrical solder to solder new electrical wire(s) to terminal(s) (105,
     IPL Figure 2).
(16) Position terminal assembly (-85) and secure with two screws (90).
(17) Use a crimping tool (47386) to install new terminal (TE-089) on new electrical wire.
(18) Position new terminal (TE-089) on printed circuit card assembly (20) and secure with
     lockwasher (85, IPL Figure 3) and self-locking nut (90).
(19) Use a soldering iron and electrical solder to solder new electrical wire(s) to printed circuit card
     assembly (20, IPL Figure 2).
(20) Use a soldering iron and electrical solder to solder new electrical wire(s) to circuit card
     assembly (140).
(21) Apply conformal coating to repair areas. Allow to air dry for 4 hours.
(22) Use a crimping tool (M22520/1-01) to install new contact(s) (M39029/31-241) on new electrical
     wire(s) leading to connector (J1) (45).
(23) Use an extraction/insertion tool to install contact(s) (M39029/31-241) in connector (J1) (45).
(24) Position connector (J1) (45) in housing (160) and secure with four screws (50) and
     stopnuts (55).
(25) Slide a 1.0-inch (25,4 mm) piece of heat shrink tubing (TU-285) over two new electrical wires
     leading to resistor (R1) (5).
(26) Slide two 0.5-inch (12,7 mm) pieces of heat shrink tubing (TU-285) over two new electrical
     wires leading to resistor (R1) (5).
(27) Use a soldering iron and electrical solder to solder two electrical wires to resistor (R1) (5).
(28) Slide two 0.5-inch (12,7 mm) pieces of heat shrink tubing (TU-285) over solder connections
     and use a heat gun to secure in place.
(29) Slide 1.0-inch (25,4 mm) piece of heat shrink tubing (TU-285) into place and use a heat gun to
     secure.
(30) Use a crimping tool (47386) to install new terminal (TE-089) on new electrical wire.
(31) Position new terminal (TE-089) on housing (160) and secure with washer (80) and stopnut (75).
         NOTE:         Grimes Aerospace Company does not authorize replacement of the identification plate
                       (10, IPL Figure 1) or identification label (310). For further information, contact a Grimes
                       Aerospace representative at the following address:
         A.   If illegible, remove and replace instruction plate (5) or instruction label (305) on cover subassembly
              (-15).
B. If illegible, remove and replace static caution label (315) on housing assembly (300).
C. If illegible, remove and replace MOD labels (320) on outside and inside of housing assembly (300).
9. Postrepair Procedures.
B. Wrap parts in a clean cloth to avoid contamination until ready for assembly.
1. General Information.
A. The following paragraphs provide information for assembly (including storage) of the power supply.
B. Examine the parts for damage. Refer to CHECK, section 501, for details.
C. Repair the parts before assembly. Refer to REPAIR, section 601, for details.
     D.    Refer to Table 701 for a list of materials needed for assembly (including storage). Equivalent
           substitutes are acceptable.
     NOTE:     Refer to IPL Figure 1 for an illustration. Numbers in parentheses ( ) refer to item numbers on
               the illustration.
A. Position bracket assembly (-65) on cover plate (110) and secure with two screws (70).
B. Position two bracket subassemblies (-50) on cover plate (110) and secure with four screws (35).
C. Position two receptacles (40) on bracket subassemblies (-50) and secure with locknut (45).
D. Position four studs (20) on cover plate (110) and secure with washers (25).
     NOTE:    Refer to IPL Figure 1 for an illustration. Numbers in parentheses ( ) refer to item numbers on
              the illustration.
     B.   Place a bead of adhesive (AD-053) on housing (185) where battery subassembly (BT1) (275) will be
          positioned.
     C.   Position battery subassembly (BT1) (275) on housing (185). Use a clean cloth to remove excess
          adhesive. Allow to air dry for 4 hours.
     D.   Position housing (295) on housing (185). Apply adhesive (AD-300) to threads of six screws (175)
          and secure housing (295) to housing (185). Use a clean cloth to remove excess adhesive. Allow to
          air dry for 4 hours.
     E.   Position insulator (130) on support (165) and secure with screw (135), washer (140) and
          stopnut (145).
F. Position two studs (160) and stud (155) on support (165) and secure with three washers (150).
G. Position support (165) on battery assembly (-115A) and secure with four screws (125).
     NOTE:    Refer to IPL Figure 1 for an illustration. Numbers in parentheses ( ) refer to item numbers on
              the illustration.
     A.   Position cover subassembly (-15) on battery assembly (-115A) and secure by tightening studs (155)
          and (160).
     B.   Position battery assembly (-115A) and cover subassembly (-15) on housing assembly (300) and
          secure by tightening four studs (20).
C. Test power supply. Refer to TESTING AND FAULT ISOLATION, section 101, for details.
5. Storage.
     NOTE:          Refer to IPL Figure 1 for an illustration. Numbers in parentheses ( ) refer to item numbers
                    on the illustration.
          (1) Subjection to extreme variations in temperature during storage or shipment will cause some
              loss of charge due to “self-discharge” characteristics of nickel-cadmium cells.
          (2) Storage temperatures should not go below -40 °F (-40 °C) or more than 165 °F (74 °C) to
              prevent damage to cell structures. At storage temperatures above 100 °F (37.78 °C), self-
              discharge will increase considerably compared to self-discharge at 68 °F (20 °C). Cold storage
              at 32 °F (0 °C) offers definite improvement of charge retention and is recommended when
              practical.
          (1) Power supplies or battery assemblies in a fully charged state may be stored under the following
              controlled conditions and placed into immediate service without additional charging:
(1) Battery assemblies may be stored in the power supply or removed from the power supply.
          (2) Battery assemblies may be stored at -4 °F (-20 °C) to 122 °F (50 °C) for an indefinite storage
              period.
          (1) Power supply and battery assembly (BT1) (275) removed from storage should be inspected for
              visible damage. Battery terminals and contacts should be cleaned prior to charging. A white
              deposit present on battery terminals and/or contacts is not abnormal and may be removed with
              a clean cloth dampened with warm water.
(2) Apply a constant DC current of 265 mA to battery assembly (BT1) (275) for 16 to 20 hours.
     (3) At completion of the charging operation, and with the power supply still on charge, battery
         assembly (BT1) (275) shall measure a minimum of 8.4 Vdc. If less than 8.4 Vdc is measured,
         continue the charging operation for an additional 4 hours.
     (4) If the battery assembly (BT1) (275) still does not measure a minimum of 8.4 Vdc, replace
         battery assembly (BT1) (275).
E. Trickle-charge storage.
     (1) Fully charged battery assembly (BT1) (275) may be stored under trickle-charge condition for up
         to six months and be placed into immediate service without additional charging.
     (3) A battery assembly (BT1) (275) stored under trickle-charge condition in excess of six months
         should not be immediately placed in service. Instead, battery assembly (BT1) (275) should be
         removed and discharged under a 2-amp load down to 0.9 Vdc per cell and then charged for 24
         hours.
          NOTE:         Battery cells should be individually loaded and measured to detect shorted or
                        reverse-charged cells.
(4) To trickle-charge battery assembly (BT1) (275), apply a constant current of 100 mA dc.
(1) Wipe the power supply with a clean cloth to remove dirt, dust and foreign material.
(2) Preserve the power supply in accordance with MIL-P-116, Method 1-A-8.
(3) Wrap the power supply in wrapping material and place in plastic bag.
     (4) Place cushion and dunnage material, desiccant and the power supply in unit container, then
         seal with masking tape.
     (5) Mark outside of unit container in accordance with MIL-STD-129. Also include overhaul date and
         location.
1. General Information.
       A.     The following paragraphs provide information for special tools, fixtures and equipment used for
              overhaul of the power supply.
       B.     Refer to Table 901 for a list of this equipment. These items may be purchased from Grimes
              Aerospace Company, the original manufacturer or, in some cases, locally manufactured. Refer to
              the referenced figure for details. Equivalent substitutes are acceptable.
1. General Information.
     A.   The Illustrated Parts List (IPL) provides a breakdown of assemblies, subassemblies and detail parts
          of the power supply. All parts are listed, except for parts which lose their identities by being
          permanently fastened to other parts or are part of an assembly not subject to disassembly.
     B.   Bulk materials such as backshells, contacts, ring terminals, safety or electrical wires, strain reliefs,
          tape and Ty-Raps and consumable materials such as adhesives, sealants, lubricants, solder, paints
          and primers are not included in the detailed parts lists. These materials are identified in the
          materials list at the beginning of each section.
     C.   To find a part number when the part number is unknown, locate the part on the illustration and note
          the item number. Locate the item number on the detailed parts list. The part number will be shown
          on the same line. In some instances there are gaps in item number sequence and the item numbers
          are not continuously sequential.
2. Explanation of Columns, Terms and Symbols in the Illustrated Parts List (IPL).
     A.   FIG. & ITEM NO. column: The figure and item numbers key the detailed parts list to the applicable
          illustration. The first number represents the figure number of the illustration. The item number
          corresponds to an item number on the illustration.
          (1) An item number not on the illustration is identified by a dash (-) preceding the item number.
              This can indicate the following:
               (a) When two or more visually alike parts are listed in sequence, only the first part is
                   illustrated. The illustration, however, is applicable to both parts.
               (b) When detail parts of an assembly or installation are separately illustrated, the resulting
                   assembly may be illustrated as an assembly by bracketing the detail parts and identifying
                   the bracket as the assembly. If brackets are not used, the detail parts are illustrated, but
                   the assembly is not.
          (2) An item number followed by an alphabetical character such as A, B, C, etc., indicates the part
              listed is similar to the same item number without the alphabetical character. The difference
              could be each part is used for a different next higher assembly (NHA) or is an equivalent part.
              This will be noted in the NOMENCLATURE or EFF CODE columns.
     B.   PART NUMBER column: This column contains the original manufacturer’s part number of the
          assembly, subassembly or detail part listed. Part numbers in this IPL are those of Grimes
          Aerospace Company, Urbana, Ohio (V72914) or are standard parts unless a Commercial and
          Government Entity (CAGE) code appears in the NOMENCLATURE column. Refer to paragraph 4
          for details. The following phrases may be used in this column:
              “ORDER NHA” is used when no part number exists for the part listed or when it is preferable to
               order an assembly rather than detail parts. ORDER NHA items which have no part numbers
               are not procurable and should not be ordered. The next higher assembly, however, is
               procurable and may be ordered.
         “REF” followed by an assigned number (for example REF001) is used when the part number is
          more than fifteen digits. The original part number with more than fifteen digits is listed in the
          NOMENCLATURE column and is the part number to be used when ordering the part.
C.   AIRLINE STOCK NO. column: This column is reserved for airline part numbers and accommodates
     eleven numbers.
D.   NOMENCLATURE column: This column identifies the parts being listed by noun name followed by
     modifiers when applicable. This includes assemblies which are not broken down within the IPL.
     Assemblies which are broken down within the IPL will be listed in plain English. This column also
     provides the following information:
     (1) The relationship of each listed item to its next higher assembly (NHA) is shown by an indenture
         code. Each listed item is placed in the NOMENCLATURE column one indenture (one dot) to
         the right of the assembly to which it belongs. Items at equal indentures are all components of a
         single assembly or subassembly. An example of the indenture code system is shown below:
1 2 3 4 5 6 7
(2) Symbols used, with the exception of effectivity and CAGE codes, are as follows:
              “SUPSD” identifies a part no longer authorized for use; quantities will be listed as “NP.”
               Example: (SUPSD BY ITEM XXX).
 “SUPSDS” identifies the newer part to be used. Example: (SUPSDS ITEM XXX).
              “REPLACES” or “REPLACES ITEM XXX” identifies this part is newer and therefore more
               desirable than the “REPLACED” part. However, either may be used.
                   “REPLACED” or “REPL BY ITEM XXX” identifies this part is older and therefore less
                    desirable than the “REPLACES” part. However, either may be used.
                   “ALTN PART FOR ITEM XXX” identifies this part as an alternative. However, either part
                    may be used and neither is more desirable than the other.
                   “TPN” precedes a True Part Number with all dashes, slashes, spaces and/or symbols
                    assigned by the original manufacturer of the part. This is the part number to be used
                    when ordering the part.
     E.   EFF CODE column: This column establishes part relationship with assemblies, which are essentially
          the same, but have minor variations. These assemblies are the end items on the detailed parts list
          and are assigned reference letters such as A, B, C, D, etc. Subassemblies or detail parts, which are
          not common to all configurations, but are associated with one or more of the coded end items, carry
          the letter or letters assigned to the end item(s) with which they are associated. If a part is common
          to all end items, the EFF CODE column is blank.
     F.   UNITS PER ASSY column: This column shows the quantity of each item required for the next higher
          subassembly, assembly or installation outline. The quantity shown for attaching parts is the total
          number required for the related part, subassembly or assembly and, therefore, may not be the total
          quantity used for the end item of the detailed parts list. The following letters may be used in this
          column:
              “AR” indicates “as required” and refers to variable quantity items such as shims, spacers or
               similar items.
              “RF” indicates "reference" and refers to items and their quantities which are listed elsewhere
               and are provided here as a reference only.
              "NP" indicates "nonprocurable" and refers to items which are not procurable and may not be
               ordered.
3. Abbreviations. Standard abbreviations used in the IPL agree with MIL-STD-12, except as noted below:
Abbreviation Definition
None
     A.   CAGE codes, preceded by the capital letter "V" (V12345), are used to identify the original
          manufacturer of non-Grimes Aerospace Company (V72914) components. CAGE codes are listed in
          the NOMENCLATURE column, except for the Government codes below, which are not listed:
5.   Overhaul. The power supply may be returned to Grimes Aerospace (V72914) for overhaul. For further
     information, contact a Grimes Aerospace representative at the following address:
       Housing Assembly
         IPL Figure 2